<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="vue-2.4.0.js" ></script>
</head>

<body>
       
    <div id="app">
        <div v-show="isshow">div的值</div>
        <br>
        <button v-on:click="toggle">更变</button>
    </div>
</body>

<script>
    var vm = new Vue({
        el:'#app',
        data:{
           isshow:false,
        },
        methods:{
            toggle:function(){
                if(this.isshow){
                    this.isshow = false;
                }else{
                    this.isshow = true;
                }
            }
        }
       
    });

</script>
</html>